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34
Sep 7, 2016
09/16
by
Hartnack, Daniel
texts
eye 34
favorite 0
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Topic: bub_upload
Source: http://books.google.com/books?id=ytQGAAAAcAAJ&hl=&source=gbs_api
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73
Sep 7, 2016
09/16
by
Hartnack, Daniel
texts
eye 73
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=ymBEAAAAcAAJ&hl=&source=gbs_api
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41
May 31, 2019
05/19
by
Hartnack, Justus
texts
eye 41
favorite 0
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215 p. ; 24 cm
Topics: Philosophy, Modern -- 18th century, Philosophy, Modern -- 19th century
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19
Jul 5, 2019
07/19
by
Hartnack, Justus
texts
eye 19
favorite 2
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140 p.; 23 cm. -
Topic: Language and languages -- Philosophy
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19
Jun 13, 2019
06/19
by
Hartnack, Justus
texts
eye 19
favorite 2
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[8], 146 p. 23 cm
Topic: Kant, Immanuel, 1724-1804 -- Knowledge, Theory of
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19
Jun 20, 2019
06/19
by
Hartnack,Justus
texts
eye 19
favorite 0
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146p. ; 21 cm.--
Topic: Kant, Immanuel, 1724-1804. -- Knowledge,Theory of
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93
Sep 19, 2014
09/14
by
Daniel Hartnack
texts
eye 93
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=0bYAAAAAcAAJ&hl=&source=gbs_api
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117
Oct 6, 2010
10/10
by
Hartnack, Justus
texts
eye 117
favorite 6
comment 0
Bibliographical footnotes
Topic: Wittgenstein, Ludwig, 1889-1951
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39
Sep 19, 2013
09/13
by
Christoph Hartnack
texts
eye 39
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In this article the production of $K^+$ at energies close to the threshold is studied in detail. The production mechanisms, the influence of in-medium effects, cross sections, the nuclear equation of state and the dynamics of the nucleons on the kaon dynamics are discussed. A special regard will be taken on the collision of Au+Au at 1.5 GeV, a reaction that has recently been analyzed in detail by experiments performed by the KaoS and FOPI collaborations at the SIS accelerator at GSI.
Source: http://arxiv.org/abs/nucl-th/0507002v1
Topic: bub_upload
Source: http://books.google.com/books?id=qphJKZshIJAC&hl=&source=gbs_api
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307
Dec 21, 2014
12/14
by
Daniel Hartnack
texts
eye 307
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=U_xMH4S7koQC&hl=&source=gbs_api
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42
Sep 23, 2013
09/13
by
C. Hartnack; J. Aichelin
texts
eye 42
favorite 0
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We study the reaction Au+Au at 1.48 AGeV and analyze the influence of the KN optical potential on cm spectra and azimuthal distributions at mid-rapidity. We find a significant change of the yields but only slight changes in the shapes of the distributions when turning off the optical potential. However, the spectra show contributions from different reaction times, where early kaons contribute stronger to higher momenta and late kaons to lower momenta. Azimuthal distributions of the kaons at...
Source: http://arxiv.org/abs/nucl-th/0312122v1
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34
Sep 18, 2013
09/13
by
Ch. Hartnack; J. Aichelin
texts
eye 34
favorite 0
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The Quantum Molecular Dynamics Model (IQMD) is used to investigate the origin of the collective transverse velocity observed in heavy ion experiments. We find that there are three contributions to this effect: initial-final state correlations, potential interactions and collisions. For a given nuclear equation of state (eos) the increase of the transverse velocity with increasing beam energy is caused by the potential part. For a given beam energy the collective transverse velocity is...
Source: http://arxiv.org/abs/nucl-th/9901087v2
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81
Mar 30, 2018
03/18
by
Hartnack, Daniel, 1642-1708
texts
eye 81
favorite 0
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Binding: red goatskin, tooled in gilt on boards, spine (author on green label), edges of boards, and turn-ins. Page edges red
Topics: Perspective, Optical instruments
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34
Sep 22, 2013
09/13
by
Jörg Aichelin; Christoph Hartnack
texts
eye 34
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We summarize what we have learnt about the kaon production in nucleus-nucleus collisions in the last decade. We will address three questions: a) Is the $K^+$ production sensitive to the nuclear equation of state? b) How can it happen that at the same excess energy the same number of $K^+$ and $K^-$ are produced in heavy ion collisions although the elementary cross section in pp collisions differs by orders of magnitudes? and c) Why kaons don't flow?
Source: http://arxiv.org/abs/nucl-th/0011050v1
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33
Sep 21, 2013
09/13
by
C Hartnack; H Oeschler; J Aichelin
texts
eye 33
favorite 0
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The Isospin Quantum Molecular Dynamics model is used to compare spectra and elliptic flow of kaons produced at subthreshold energies with data taken at the SIS accelerator at GSI. We find that temperatures of the spectra are dominated by the rescattering of the kaons. The study of elliptic flow observables indicates the influence of rescattering as well as of the optical potential of the kaons with increasing dominance of the optical potential at lower incident energies.
Source: http://arxiv.org/abs/0712.0316v1
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28
Sep 19, 2013
09/13
by
Ch. Hartnack; H. Oeschler; Jörg Aichelin
texts
eye 28
favorite 0
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In astrophysics as well as in hadron physics progress has recently been made on the determination of the hadronic equation of state (EOS) of compressed matter. The results are contradictory, however. Simulations of heavy ion reactions are now sufficiently robust to predict the stiffness of the (EOS) from (i) the energy dependence of the ratio of $K^+$ from Au+Au and C+C collisions and (ii) the centrality dependence of the $K^+$ multiplicities. The data are best described with a compressibility...
Source: http://arxiv.org/abs/nucl-th/0610005v2
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44
Sep 22, 2013
09/13
by
C. David; C. Hartnack; J. Aichelin
texts
eye 44
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We investigate the different contributions to the in-plane flow of K+ mesons observed recently by the FOPI collaboration in the reaction Ni(1.93 AGeV)+Ni. Due to the kinematics of the three body phase space decay the flow of kaons produced in baryon-baryon interactions is smaller than that of the baryons in the entrance channel. On the contrary, in pi N interactions the flow of the sources and of the kaons are identical. Therefore the total kaon flow depends on the relative number of Delta N...
Source: http://arxiv.org/abs/nucl-th/9805017v2
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35
Sep 19, 2013
09/13
by
C Hartnack; H Oeschler; J Aichelin
texts
eye 35
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Using the Isospin Quantum Molecular Dynamics (IQMD) model we analyzed the production of pions and kaons in the energy range of 1-2 AGeV in order to study the question why thermal models could achieve a successful description. For this purpose we study the variation of pion and kaon yields using different elementary cross sections. We show that several ratios appear to be rather robust versus their variations.
Source: http://arxiv.org/abs/1010.0791v1
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38
Sep 23, 2013
09/13
by
Ch. Hartnack; H. Oeschler; J. Aichelin
texts
eye 38
favorite 0
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In heavy ion reactions at energies around 1-2 AGeV the measured $K^-$ yields appear rather high as compared to pp collisions as shown by the KaoS collaboration. Employing IQMD simulations, we show that this is caused by the fact that the dominant production channel is not $BB\to BBK^+K^-$ but the mesonic $\Lambda(\Sigma) \pi \to K^-B$ reaction. Because the $\Lambda $ ($\Sigma$) stem from the reaction $BB \to \Lambda(\Sigma) K^+ B$, the $K^+$ and the $K^-$ yield are strongly correlated, i.e. the...
Source: http://arxiv.org/abs/nucl-th/0109016v2
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48
Sep 20, 2013
09/13
by
Ch. Hartnack; H. Oeschler; Joerg Aichelin
texts
eye 48
favorite 0
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The stiffness of the hadronic equation of state has been extracted from the production rate of $K^+$ mesons in heavy ion collisions around 1 $A$ GeV incident energy. The data are best described with a compressibility coefficient $\kappa$ around 200 MeV, a value which is usually called ``soft''. This is concluded from a detailed comparison of the results of transport theories with the experimental data using two different procedures: (i) the energy dependence of the ratio of $K^+$ from Au+Au and...
Source: http://arxiv.org/abs/nucl-th/0506087v1
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74
Sep 23, 2013
09/13
by
Aman D. Sood; Ch. Hartnack; andJ. Aichelin
texts
eye 74
favorite 0
comment 0
The comparison of $K^+$ and $K^-$ spectra at low transverse momentum in light symmetric heavy ion reactions at energies around 2 AGeV allows for a direct experimental determination of the strength of the $K^+$ as well as of t he $K^-$ nucleus potential. Other little known or unknown input quantities like the production or rescattering cross sections of $K^+$ and $K^-$ mesons do not spoil this signal. This result, obtained by simulations of these reactio ns with the Isospin Quantum Molecular...
Source: http://arxiv.org/abs/1105.1730v1
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29
Sep 23, 2013
09/13
by
Aman D. Sood; Ch. Hartnack; Jörg Aichelin
texts
eye 29
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Here we aim to show that the ratio of the momentum spectra of $K^{+}$ at small transverse momentum measured for symmetric systems of different sizes can be such an observable.
Source: http://arxiv.org/abs/1109.6785v1
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51
Sep 23, 2013
09/13
by
Aman D. Sood; Ch. Hartnack; Jörg Aichelin
texts
eye 51
favorite 0
comment 0
We aim to show that K+ and K- spectra at low transverse momentum measured in light symmetric systems at around 2AGeV depend strongly on the K potential. The ratio of the spectra can allow therefore for a direct determination of the strength of the K+ as well as that of the K- potential in a hadronic environment.
Source: http://arxiv.org/abs/1109.6784v1
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40
Sep 23, 2013
09/13
by
Aman D. Sood; Ch. Hartnack; Jörg Aichelin
texts
eye 40
favorite 0
comment 0
We aim to explore the in-medium effects on the transverse momentum ($p_{T}$) spectra of $K^{+}$ and $K^{-}$ in lighter mass system $^{12}C+^{12}C$.
Source: http://arxiv.org/abs/1109.6771v1
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43
Sep 22, 2013
09/13
by
M. Thomère; C. Hartnack; G. Wolf; J. Aichelin
texts
eye 43
favorite 0
comment 0
Recently the HADES collaboration has published the invariant mass spectrum of $e^+e^-$ pairs, dN/dM$_{e^+e^-}$, produced in C+C collisions at 2 AGeV. Using electromagnetic probes, one hopes to get in this experiment information on hadron properties at high density and temperature. Simulations show that firm conclusions on possible in-medium modifications of meson properties will only be possible when the elementary meson production cross sections, especially in the pn channel, as well as...
Source: http://arxiv.org/abs/nucl-th/0702004v3
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30
Sep 23, 2013
09/13
by
C. Hartnack; A. Sood; H. Oeschler; J. Aichelin
texts
eye 30
favorite 0
comment 0
Comparing K+ spectra at low transverse momenta for different symmetric collision systems at beam energies around 1 AGeV allows for a direct determination of both the strength of the K+ nucleus potential as well as of the K+N rescattering cross section in a hadronic environment. Other little known or unknown quantities which enter the K+ dynamics, like the production cross sections of K+ mesons or the hadronic equation of state, do not spoil this signal as they cancel by using ratios of spectra....
Source: http://arxiv.org/abs/1012.3539v1
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2.0
Jun 29, 2018
06/18
by
A. Le Fevre; Y. Leifels; C. Hartnack; J. Aichelin
texts
eye 2
favorite 0
comment 0
Recently it has been discovered that the rapidity dependence of the elliptic flow, $v_2$, of charged particles shows the strongest sensitivity to the Nuclear Equation of State (EoS) which has been observed within a microscopic model. This dependence on the nuclear EoS is predicted by Quantum Molecular Dynamics (QMD) calculations \cite{Fevre:2015fza} which show as well that the absorption or rescattering of in-plane emitted particles by the spectator matter is not the main reason for the EoS...
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1611.07500
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3.0
Jun 28, 2018
06/18
by
Christoph Hartnack; Arnaud Le Fèvre; Yvonne Leifels; Jörg Aichelin
texts
eye 3
favorite 0
comment 0
We use the Isospin Quantum Molecular Dynamics approach supplemented with a phase space coalescence to study the properties of the production of hypertritons. We see strong influences of the hyperon rescattering on the yields. The hypertritons show up to be quite aligned to the properties of nuclear matter underlining the necessity of rescattering to transport the hyperons to the spectator matter.
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1511.02646
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52
Sep 19, 2013
09/13
by
S. A. Bass; C. Hartnack; H. Stoecker; W. Greiner
texts
eye 52
favorite 0
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Triple differential cross sections of pions in heavy ion collisions at 1 GeV/nucl. are studied with the IQMD model. After discussing general properties of $\Delta$ resonance and pion production we focus on azimuthal correlations: At projectile- and target-rapidities we observe an anticorrelation in the in-plane transverse momentum between pions and protons. At c.m.-rapidity, however, we find that high $p_t$ pions are being preferentially emitted perpendicular to the event-plane. We investigate...
Source: http://arxiv.org/abs/nucl-th/9501002v1
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48
Sep 21, 2013
09/13
by
S. Soff; S. A. Bass; C. Hartnack; H. Stoecker; W. Greiner
texts
eye 48
favorite 0
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We investigate the disappearance of collective flow in the reaction plane in heavy-ion collisions within a microscopic model (QMD). A systematic study of the impact parameter dependence is performed for the system Ca+Ca. The balance energy strongly increases with impact parameter. Momentum dependent interactions reduce the balance energies for intermediate impact parameters $b\approx4.5$ fm. Dynamical negative flow is not visible in the laboratory frame but does exist in the contact frame for...
Source: http://arxiv.org/abs/nucl-th/9502007v1
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31
Oct 21, 2014
10/14
by
Hartnack, Sonja; Nathues, Christina; Nathues, Heiko; Grosse Beilage, Elisabeth; Lewis, Fraser Iain
texts
eye 31
favorite 0
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This article is from PLoS ONE , volume 9 . Abstract For swine dysentery, which is caused by Brachyspira hyodysenteriae infection and is an economically important disease in intensive pig production systems worldwide, a perfect or error-free diagnostic test (“gold standard”) is not available. In the absence of a gold standard, Bayesian latent class modelling is a well-established methodology for robust diagnostic test evaluation. In contrast to risk factor studies in food animals, where...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4048188
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5.0
Jun 26, 2018
06/18
by
A. Le Fèvre; Y. Leifels; W. Reisdorf; J. Aichelin; Ch. Hartnack
texts
eye 5
favorite 0
comment 0
Using FOPI data on elliptic flow in Au+Au collisions between 0.4 and 1.5A GeV we extract constraints for the equation of state (EOS) of compressed symmetric nuclear matter using the transport code IQMD by introducing an observable describing the evolution of the size of the elliptic flow as a function of rapidity. This observable is sensitive to the nuclear EOS and a robust tool to constrain the compressibility of nuclear matter up to 2 $\rho_0$.
Topics: Nuclear Experiment, Nuclear Theory
Source: http://arxiv.org/abs/1501.05246
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44
Sep 21, 2013
09/13
by
Christoph Hartnack; Helmut Oeschler; Yvonne Leifels; Elena L. Bratkovskaya; Jörg Aichelin
texts
eye 44
favorite 0
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We discuss strangeness production close to threshold in p+A and A+A collision. Comparing the body of available K+, K0, K-, and Lambda data with the IQMD transport code and for some key observables as well with the HSD transport code, we find good agreement for the large majority of the observables. The investigation of the reaction with help of these codes reveals the complicated interaction of the strange particles with hadronic matter which makes strangeness production in heavy-ion collisions...
Source: http://arxiv.org/abs/1106.2083v2
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37
Sep 20, 2013
09/13
by
C. David; C. Hartnack; M. Kerveno; J. -Ch. Le Pallec; J. Aichelin
texts
eye 37
favorite 0
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Applying a new method of rescattering which is based on the neural network technique we study the influence of rescattering on the spectra of strange particles produced in heavy ion reactions. In contradistinction to former approaches the rescattering is done explicitly and not in a perturbative fashion. We present a comparison of our calculations for the system Ni(1.93AGeV)+Ni with recent data of the FOPI collaboration. We find that even for this small system rescattering changes the...
Source: http://arxiv.org/abs/nucl-th/9611016v1
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43
Sep 18, 2013
09/13
by
M. Germain; Ch. Hartnack; J. L. Laville; J. Aichelin; M. Belkacem; E. Suraud
texts
eye 43
favorite 0
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Several models have been proposed to simulate heavy ion reactions beyond the mean field level. The lack of data in phase space regions which may be sensitive to different treatments of fluctuations made it difficult to judge these approaches. The recently published high energy proton spectra, measured in the reaction 94 AMeV Ar + Ta, allow for the first time for a comparison of the models with data. We find that these spectra are reproduced by Quantum Molecular Dynamics (QMD) and Boltzmann...
Source: http://arxiv.org/abs/nucl-th/9901062v1
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71
Jul 19, 2013
07/13
by
Sakshi Gautam; Rajiv Chugh; Aman D. Sood; Rajeev K. Puri; Ch. Hartnack; J. Aichelin
texts
eye 71
favorite 0
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Using the isospin-dependent quantum molecular dynamics model we study the isospin effects on the disappearance of flow for the reactions of $^{58}Ni$ + $^{58}Ni$ and $^{58}Fe$ +$^{58}Fe$ as a function of impact parameter. We found good agreement between our calculations and experimentally measured energy of vanishing flow at all colliding geometries. Our calculations reproduce the experimental data within 5%(10%) at central (peripheral) geometries.
Source: http://arxiv.org/abs/1005.1443v2
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33
Sep 18, 2013
09/13
by
C. Hartnack; Rajeev K. Puri; J. Aichelin; J. Konopka; S. A. Bass; H. Stoecker; W. Greiner
texts
eye 33
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Basic problems of the semiclassical microscopic modelling of strongly interactingsystems are discussed within the framework of Quantum Molecular Dynamics (QMD). This model allows to study the influence of several types of nucleonic interactions on a large variety of observables and phenomena occurring in heavy ion collisions at relativistic energies.It is shown that the same predictions can be obtained with several -- numerically completely different and independently written -- programs as far...
Source: http://arxiv.org/abs/nucl-th/9811015v1
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41
Sep 19, 2013
09/13
by
Sven Soff; D. Zschiesche; M. Bleicher; C. Hartnack; M. Belkacem; L. Bravina; E. Zabrodin; S. A. Bass; H. Stoecker; W. Greiner; ;
texts
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The yields of strange particles are calculated with the UrQMD model for p,Pb(158 AGeV)Pb collisions and compared to experimental data. The yields are enhanced in central collisions if compared to proton induced or peripheral Pb+Pb collisions. The enhancement is due to secondary interactions. Nevertheless, only a reduction of the quark masses or equivalently an increase of the string tension provides an adequate description of the large observed enhancement factors (WA97 and NA49). Furthermore,...
Source: http://arxiv.org/abs/nucl-th/0010103v1
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71
Sep 24, 2013
09/13
by
E. E. Kolomeitsev; C. Hartnack; H. W. Barz; M. Bleicher; E. Bratkovskaya; W. Cassing; L. W. Chen; P. Danielewicz; C. Fuchs; T. Gaitanos; C. M. Ko; A. Larionov; M. Reiter; Gy. Wolf; J. Aichelin
texts
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We compare multiplicities as well as rapidity and transverse momentum distributions of protons, pions and kaons calculated within presently available transport approaches for heavy ion collisions around 1 AGeV. For this purpose, three reactions have been selected: Au+Au at 1 and 1.48 AGeV and Ni+Ni at 1.93 AGeV.
Source: http://arxiv.org/abs/nucl-th/0412037v2
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35
Sep 20, 2013
09/13
by
L. A. Winckelmann; C. Ernst; L. Gerland; J. Konopka; S. Soff; S. A. Bass; M. Bleicher; M. Brandstetter; A. Dumitru; C. Spieles; H. Weber; C. Hartnack; J. Aichelin; N. Amelin; H. Stöcker; W. Greiner
texts
eye 35
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The behavior of hadronic matter at high baryon densities is studied within Ultrarelativistic Quantum Molecular Dynamics (URQMD). Baryonic stopping is observed for Au+Au collisions from SIS up to SPS energies. The excitation function of flow shows strong sensitivities to the underlying equation of state (EOS), allowing for systematic studies of the EOS. Dilepton spectra are calculated with and without shifting the $\rho$ pole. Except for S+Au collisions our calculations reproduce the CERES data.
Source: http://arxiv.org/abs/nucl-th/9610042v1
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46
Sep 20, 2013
09/13
by
L. A. Winckelmann; S. A. Bass; M. Bleicher; M. Brandstetter; A. Dumitru; C. Ernst; L. Gerland; J. Konopka; S. Soff; C. Spieles; H. Weber; C. Hartnack; J. Aichelin; N. Amelin; H. Stöcker; W. Greiner
texts
eye 46
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The behavior of hadronic matter at high baryon densities is studied within Ultrarelativistic Quantum Molecular Dynamics (URQMD). Baryonic stopping is observed for Au+Au collisions from SIS up to SPS energies. The excitation function of flow shows strong sensitivities to the underlying equation of state (EOS), allowing for systematic studies of the EOS. Effects of a density dependent pole of the $\rho$-meson propagator on dilepton spectra are studied for different systems and centralities at...
Source: http://arxiv.org/abs/nucl-th/9610033v1
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33
Sep 19, 2013
09/13
by
A. Le Fevre; J. Aichelin; C. Hartnack; J. Lukasik; W. F. J. Mueller; H. Orth; C. Schwarz; C. Sfienti; W. Trautmann; K. Turzo; B. Zwieglinski; A. Chbihi; J. D. Frankland; J. P. Wieleczko; M. Vigilante
texts
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Recently, is has been observed that events with the {\it same} total transverse energy of light charged particles (LCP) in the quasi target region, $E_{\perp 12}^{QT}$, show two quite distinct reaction scenarios in the projectile domain: multifragmentation and residue production. This phenomenon has been dubbed "bimodality". Using Quantum Molecular Dynamics calculations we demonstrate that this observation is very general. It appears in collisions of all symmetric systems larger than...
Source: http://arxiv.org/abs/0909.4288v1
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46
Sep 18, 2013
09/13
by
S. A. Bass; M. Belkacem; M. Bleicher; M. Brandstetter; L. Bravina; C. Ernst; L. Gerland; M. Hofmann; S. Hofmann; J. Konopka; G. Mao; L. Neise; S. Soff; C. Spieles; H. Weber; L. A. Winckelmann; H. Stöcker; W. Greiner; Ch. Hartnack; J. Aichelin; N. Amelin
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In this paper, the concepts of microscopic transport theory are introduced and the features and shortcomings of the most commonly used ansatzes are discussed. In particular, the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) transport model is described in great detail. Based on the same principles as QMD and RQMD, it incorporates a vastly extended collision term with full baryon-antibaryon symmetry, 55 baryon and 32 meson species. Isospin is explicitly treated for all hadrons. The range...
Source: http://arxiv.org/abs/nucl-th/9803035v2
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2.0
Jun 29, 2018
06/18
by
Jun Xu; Lie-Wen Chen; ManYee Betty Tsang; Hermann Wolter; Ying-Xun Zhang; Joerg Aichelin; Maria Colonna; Dan Cozma; Pawel Danielewicz; Zhao-Qing Feng; Arnaud Le Fevre; Theodoros Gaitanos; Christoph Hartnack; Kyungil Kim; Youngman Kim; Che-Ming Ko; Bao-An Li; Qing-Feng Li; Zhu-Xia Li; Paolo Napolitani; Akira Ono; Massimo Papa; Taesoo Song; Jun Su; Jun-Long Tian; Ning Wang; Yong-Jia Wang; Janus Weil; Wen-Jie Xie; Feng-Shou Zhang; Guo-Qiang Zhang
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Transport simulations are very valuable for extracting physics information from heavy-ion collision experiments. With the emergence of many different transport codes in recent years, it becomes important to estimate their robustness in extracting physics information from experiments. We report on the results of a transport code comparison project. 18 commonly used transport codes were included in this comparison: 9 Boltzmann-Uehling-Uhlenbeck-type codes and 9 Quantum-Molecular-Dynamics-type...
Topics: Nuclear Experiment, Nuclear Theory
Source: http://arxiv.org/abs/1603.08149
